Narada Power Source CO., LTD TT Series Battery Operation Manual
3-3 Equalization charge voltage at different temperature
Ambient
Temperature
（℃）
Equalization charge
Voltage
（
V/Cell
）
0
2.53
5
2.50
10
2.48
15
2.45
20
2.43
25
2.40
30
2.38
35
2.35
40
2.33
3.4.
Ambient Temperature Vs. Battery Life
Higher temperature will harm the battery and reduce battery life. When temperature
exceeds 25
℃
, the battery life will decrease half per 10
℃
temperature raise. For example, the
designed life of battery at 25
℃
is 5 years, when battery operates at 35
℃
, the actual life is only
2.5 years.
t
25
＝
t
T
×
2
（
T
－
25
）
/10
Notes
：
T the actual ambient temperature;
t
T
is designed life at T ambient temperature
t
25
is designed life at 25
℃
ambient temperature
The heats disseminate performance of VRLA battery is bad, it’s liable to cause thermal run
away when heat accumulates. Please improve ventilation and temperature condition when room
temperature is high. The distances between batteries should not be smaller than 10mm. Please
also adjust the float voltage and equalization voltage according the manual.
4. Charge and discharge requirements
4
.
1. Equalization charge
Equalization charge is needed in following conditions:
－
The voltage of at least two batteries are lower than 2.18V/cell
－
Floating operation for more than three months
15
